// lib/memory.js

module.exports = {
    saveMemory: function (db, label, data, callback = () => {}) {
        db.run(
        `INSERT OR REPLACE INTO memory (label, data) VALUES (?, ?)`,
        [label, JSON.stringify(data)],
        callback
        );
    },

    getMemory: function (db, label, callback) {
        db.get(
        `SELECT data FROM memory WHERE label = ?`,
        [label],
        (err, row) => {
            if (err) return callback(err, null);
            if (!row) return callback(null, null);
            try {
            callback(null, JSON.parse(row.data));
            } catch (e) {
            callback(e, null);
            }
        }
        );
    },

    forgetMemory: function (db, label, callback = () => {}) {
        db.run(
        `DELETE FROM memory WHERE label = ?`,
        [label],
        callback
        );
    },

    listMemory: function (db, callback) {
        db.all(`SELECT label, data FROM memory`, [], (err, rows) => {
        if (err) return callback(err, null);
        const parsed = rows.map(row => ({
            label: row.label,
            data: (() => {
            try {
                return JSON.parse(row.data);
            } catch {
                return row.data;
            }
            })()
        }));
        callback(null, parsed);
        });
    }
};